Question

A flow of 4 kg/s ammonia goes through a device in a polytropic process with an inlet state of 150 kPa, -20°C and an exit state of 400 kPa, 80°C. Find the polytropic exponent n, the specific work and heat transfer. 

Answer 1

C.V. Steady state device, single inlet and single exit flow.

Notice: dP > 0 so dw <0

ds > 0 so dq